Get your IATA SIS invoices through an API

What you can build on SIS

• Get payable invoices for a billing period

  Build this

  Reads the Miscellaneous Payables Invoice Search results in IS-WEB for one billing year, month and period: the invoices other members billed to you.

  Takes

  Billing year and month, billing period, transaction type (optional)

  Returns

  Billing member, invoice or credit note number, transaction type, charge category, settlement method, billing amount, currency, billing period

• Check receivable invoice statuses

  Build this

  Reads Miscellaneous Receivables Manage Invoice for a billing period, with each invoice's status and its payment status.

  Takes

  Billing year and month, billing period, invoice status (optional)

  Returns

  Invoice number, billed member, charge category, billing amount, invoice status, billing period, payment status

• List open correspondence cases

  Build this

  Reads the correspondence search on the Miscellaneous Billing History and Correspondence screen: each case, its status and sub-status.

  Takes

  Billing member (optional), status (optional)

  Returns

  Invoice number, billing member, correspondence status, sub-status, amount

• Save a rejection invoice for a payable

  Build this

  Opens a payable invoice from Payables Invoice Search, selects Reject, picks the line items and saves the rejection invoice in Open status for you to review.

  Takes

  Payable invoice number, billing period, line items to reject, rejection invoice number, note

  Returns

  Rejection invoice number, rejected invoice number, rejection stage, amount, status

Automate SIS with a workflow

A workflow runs your methods as one process, with nobody at the screen. A schedule or a call from your own system starts it, the steps run in order, and the result arrives in your inbox or in the systems you already use.

• New payable invoices, posted to accounting

  Build this

  Starts

  Every weekday at 8:00

  Step 1

  Get the payable invoices for the latest closed billing period.

  Step 2

  Keep the invoices and credit notes that were not there on the last run.

  Step 3

  Post each one, with billing member, number, charge category and amount, to your ERP webhook.

• Correspondence cases that changed, each week

  Build this

  Starts

  Every Monday at 9:00

  Step 1

  List the open correspondence cases on Billing History and Correspondence.

  Step 2

  Keep the cases that are new or whose status or sub-status changed since the last run.

  Step 3

  Email you the list so each one is answered before it expires.

• Receivable invoices stuck before submission

  Build this

  Starts

  Every weekday at 16:00

  Step 1

  Check receivable invoice statuses for the current billing period.

  Step 2

  Keep the invoices in Open or IS-Web Validation Error status.

  Step 3

  Email you the list to correct and validate in IS-WEB.

You can run a workflow by hand on every plan, Free included. Schedules and webhook triggers come with the paid plans, from $29 a month.

Once built, one call from your code

Once you have built a method, it is one POST to /v1/runs from your backend, or a tool an AI agent calls over MCP. This is what “Get payable invoices for a billing period” would look like.

curl https://api.fous.com/v1/runs \
  -H "Authorization: Bearer $FOUS_API_KEY" \
  -H "Content-Type: application/json" \
  -d '{
    "method": "portal.iata.org/get_payable_invoices",
    "input": {
      "billing_year_month": "2026-Nov",
      "billing_period": 1,
      "transaction_type": "All"
    }
  }'

{
  "status": "completed",
  "data": {
    "billing_year_month": "2026-Nov",
    "billing_period": 1,
    "invoices": [
      {
        "billing_member": "AC-104-Acme Ground Services",
        "invoice_number": "AG26110412",
        "transaction_type": "Original Invoice",
        "charge_category": "Airport",
        "settlement_method": "B - Bilateral",
        "billing_amount": 18240,
        "billing_currency": "USD"
      }
    ],
    "count": 1
  }
}

An example with invented data, not a ready-made endpoint. The method exists in your organization once you build it, and its name, inputs and fields follow your request.

SIS’s own options

IATA's SIS pages describe file exchange, not an API. Invoices are keyed in IS-WEB or uploaded as IS-XML files after testing and certification with IATA, and SIS produces output files with your payable and receivable invoices each billing period or daily. For suppliers, transaction fees apply to every invoice or rejection sent or received.

Read on November 12, 2026: SIS for suppliers, Attachment D, SIS Non-Transportation pricing schedule, SIS webinar: SIS for beginners (2024).

Signing in to SIS

SIS is reached only through the IATA Customer Portal: you sign in with your email address and password, enter a login code from an authenticator app, then open the SIS service icon. With Fous you sign in through the portal's own sign-in with your own account. The login is sealed with AES-256 and never returned by the API, and a method sees only what your SIS permissions allow.

Worth knowing

Payables appear about 2 days after the period

Invoices billed in a billing period can be viewed and downloaded on Billing Output Generation day, about 2 days after the period closes. A method run before then does not find them yet.

Correspondence lives only in IS-WEB

Rejections can go by IS-WEB or input file, but correspondence is processed in IS-WEB only and has no financial impact. An expired correspondence lets the other member bill you again.

Time limits for Miscellaneous billings

Original billings have 5 months, rejection billings 6 months and disputes 6 months. Disputes apply only to Miscellaneous bilateral invoices and carry no clearing house settlement.

Invoice numbers and statuses are strict

An invoice number is at most 10 alphanumeric characters, with no hyphen, dot or slash. Only Open invoices can be validated, and a validated invoice moves to Ready for Submission.

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